Observe the phase diagram for magnesium and lead below. There is a three phase i
ID: 908532 • Letter: O
Question
Observe the phase diagram for magnesium and lead below. There is a three phase invariant tie line on the plot. What is this point called? There is a vertical tie line at 81% wt Pb, what does this line represent? For 1kg of liquid, composition 66% wt Pb, cooled to 375oC, tell me what phases are present, what are the mass amounts of each phase, and what are the chemical compositions of each phase?
0 5 10 20 30 40 70 100 700 1200 +L 82Pb 1000 800 S 400 Mg2Pb 400 100 Mg2Pb 200 Mg 80 100 (Mg) Composition (wt% Pb)Explanation / Answer
The point where the three phase invariant tie line on the plot is called the Eutectic point.
The vertical tie line at 81% wt Pb represents the composition of Mg2Pb in the Mg-Pb system.
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